As petra says, it’s hard for anyone to know the exact truth. bullying can be perceived as that by some and not by others.
When accusations of bullying are widepread, wherever the person accused has worked, then you can be pretty sure that bullying is occurring, and it is not just some sensitive souls getting upset.
Remember she was accused of bullying behaviour, not that people 'felt' she was bullying. It means those who were not brow beaten could quite clearly see that she indulged in behaviourtowards them and othersthat was clearly meant to bully even if they were able to standup to her. They could also see that junior staff found her intimidating.